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Zinc stannate in halogen-free HIPS and silicone resins

Discussion started by Jeremy Pearce , on 09 May 04:52 PM

What work has been done at ITRI and elsewhere on these systems?

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Paul Cusack
Hi Peter - thanks for your kind and informative comments. We are very keen to start collaborating more with fire-retardant producers, users and academics in China. I know that several university groups have published papers on zinc stannates and zinc stannate coated fillers - it would be good to find out if there is much actual use of these tin-based flame retardants / smoke suppressants in China.

For information, ITRI has an office in Beijing (see details on this website).

Best regards, Paul
1839 days ago
Paul Cusack's reply is quite good hitting the target, yes, I do have some experience on HIPS-PPE blend with P-based FRs,like RDP/BDP, for achieving UL94 V-0(1.6mm) in the past time, with regard to ZS with smoke reduction capacity, it shall work well because I got good results with ZB, , I didn't test it from the very beginning due to its expansive cost, but I sure it would work.

Obviously, Paul Cusack is quite expert in FR field, I'd like to start good relationship with you, let's share something with each other in the future.

in Shanghai
1858 days ago
Hi, Paul, Well noted your points with interest
2071 days ago
Paul Cusack
As far as I recall, there isn't much on zinc stannate in halogen-free HIPS - I'm fairly certain it isn't a polymer that ITRI has worked on. We are involved in an ongoing FP7 project - ENFIRO - that aims to demonstrate the viability of halogen-free FR alternatives to conventional brominated FRs for a range of polymers, including thermoplastics used in the electronics industry. Although we haven't looked at HIPS itself, we are working on a PPE (polyphenylene ether) - HIPS blend, which also finds extensive use in electronic equipment cabinets and enclosures. This polymer blend currently uses a bromine FR + ATO system to achieve the desired level of flame retardancy (UL-94 V0), but we have shown that this can be matched using the phosphorus FRs, RDP - resorcinol bis(diphenyl phosphate) or BDP - bisphenol-A bis(diphenyl phosphate). These would appear to be the best non-halogen FRs available at present for PPE-HIPS, but I don't know if they work in HIPS itself. We are also keen to see if there is any synergism between these phosphorus FRs and, for example, ZS, but this hasn't been studied yet. In any case, ZS would be the choice additive rather than ZHS as the latter decomposes (dehydrates) at temperatures above ca. 200 deg C, so the anhydrous ZS is the best bet for HIPS and most other engineering thermoplastics.

Regarding silicone resins, again there isn't much on ZS, although US Patent 6387518 does mention tin oxide (amongst other metal oxides) in a halogen-free cross-linked silicone rubber cable material.
2082 days ago